Encoding scheme: Mapping from data bits to signal elements Key terms 신호요소가 극성의 수식적 부호를 가질때, 단극형(unipolar ... 1: negative voltage NRZ-I (NRZ Inverted) a form of differential encoding 1: 신호 반전 0 :변화없음 NRZ is s ... for B8ZS and HDB3Summary* Differential encoding - A long string of 0's cause a problem in AMI - A long